1.Oblicza) (3x-6y) (3x+6y)=b) (4x-5) (6y+7)=c) [(4x-5)*(-6y)]*(6x-7)=
a)
(3x-6y)(3x+6y)=9x²-36y²b)
(4x-5)(6y+7)=24xy+28x-30y-35 c)
[(4x-5)·(-6y)]·(6x-7)=(-24xy+30y)(6x-7)=-144x²y+168xy+180xy-210y=
=-144x²y+348xy-210y
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a)
(3x-6y)(3x+6y)=9x²-36y²
b)
(4x-5)(6y+7)=24xy+28x-30y-35
c)
[(4x-5)·(-6y)]·(6x-7)=(-24xy+30y)(6x-7)=-144x²y+168xy+180xy-210y=
=-144x²y+348xy-210y